/Engine/Source/Developer/HierarchicalLODUtilities/Public/IHierarchicalLODUtilities.h
Get the name of a HLOD proxy given the name of a level's package
[FString](API\Runtime\Core\Containers\FString) GetLevelHLODProxyName ( const [FString](API\Runtime\Core\Containers\FString) & InLevelPackageName, const uint32 HLODLevelIndex )